Sneutrino identification in dilepton events at the LHC

Abstract

Heavy neutral resonances appearing in the clean Drell-Yan channel may be the first new physics to be observed at the proton-proton CERN LHC. If a new resonance is discovered at the LHC as a (narrow) peak in the dilepton invariant mass distribution, the characterization of its spin and couplings will proceed via the measurement of production rates and angular distributions of the decay products. We discuss the discrimination of a spin-0 resonance (sneutrino) predicted by supersymmetric theories with R-parity breaking against the spin-1 of Z^\prime bosons and the Randall-Sundrum graviton resonance (spin-2) with the same mass and producing the same number of events under the observed peak. To assess the region of sneutrino parameters (couplings and masses) where the spin determination can be performed to a given confidence level, we focus on the event rate and the angular distributions of the Drell-Yan leptons, in particular using the center-edge asymmetry, A_{\rm CE}. We find that although the measured event rate permits solving the above problem partially, the center-edge asymmetry, on the contrary allows to differentiate the various spins entirely with a minimal number of events around 200.

20 pages; version to appear in PRD

References in corpus (54)

• A Large Mass Hierarchy from a Small Extra Dimension
• An Alternative to Compactification
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• The Physics of Heavy Z' Gauge Bosons
• R-parity violating supersymmetry
• Quantum Gravity and Extra Dimensions at High-Energy Colliders
• On Kaluza-Klein States from Large Extra Dimensions
• The Phenomenology of Extra Neutral Gauge Bosons
• Z-prime Gauge Bosons at the Tevatron
• Warped Phenomenology
• Experimental Probes of Localized Gravity: On and Off the Wall
• Spin determination of single-produced resonances at hadron colliders
• Bounds on R-parity Violating Couplings at the Weak Scale and at the GUT Scale
• Improved Constraints on Z' Bosons from Electroweak Precision Data
• The Hunt for New Physics at the Large Hadron Collider
• An Introduction to Explicit R-Parity Violation
• Physics searches at the LHC
• $R$-parity-Violating Supersymmetric Yukawa Couplings: A Mini-review
• Z' studies at the LHC: an update
• Minimal Z' models: present bounds and early LHC reach
• A search for high-mass resonances decaying to dimuons at CDF
• Z' Phenomenology and the LHC
• Exploring Small Extra Dimensions at the Large Hadron Collider
• Warped 5-Dimensional Models: Phenomenological Status and Experimental Prospects
• The Stueckelberg Z Prime at the LHC: Discovery Potential, Signature Spaces and Model Discrimination
• Searching for Narrow Graviton Resonances with the ATLAS Detector at the Large Hadron Collider
• Measuring Z' couplings at the LHC
• Supersymmetry with R-Parity Breaking: Contact Interactions and Resonance Formation in Leptonic Processes at LEP2
• A model independent spin analysis of fundamental particles using azimuthal asymmetries
• NLO-QCD Corrections to Dilepton Production in the Randall-Sundrum Model
• R-Parity Violating SUSY Signals in Lepton-Pair Production at the Tevatron
• Supersymmetric NLO QCD Corrections to Resonant Slepton Production and Signals at the Tevatron and the LHC
• PDF and scale uncertainties of various DY distributions in ADD and RS models at hadron colliders
• Angular distribution of Drell-Yan process at hadron colliders to NLO-QCD in models of TeV scale gravity
• Search for Randall-Sundrum gravitons in the dielectron and diphoton final states with 5.4 fb-1 of data from ppbar collisions at sqrt(s)=1.96 TeV
• Spin and model identification of Z' bosons at the LHC
• Spin identification of the Randall-Sundrum resonance in lepton-pair production at the LHC
• Using Final State Pseudorapidities to Improve s-channel Resonance Observables at the LHC
• QCD Corrections to Resonant Slepton Production in Hadron Colliders
• Bounds on R-parity Violating Couplings at the Grand Unification Scale from Neutrino Masses
• Distinguishing Indirect Signatures of New Physics at the NLC: Z' Versus R-Parity Violation
• Oblique Parameter Constraints on Large Extra Dimensions
• Discriminating graviton exchange effects from other new physics scenarios in e^+e^- collisions
• Center-Edge Asymmetry at Hadron Colliders
• Resonant sneutrino production at Tevatron Run II
• A brief review of R-parity-violating couplings
• Soft Gluon Resummation Effects in Single Slepton Production at Hadron Colliders
• QCD corrections to single slepton production at hadron colliders
• Randall-Sundrum graviton spin determination using azimuthal angular dependence
• Probing R-parity violating interactions via $p\bar{p}\to e\mu +X$ channel on Tevatron
• QCD corrections to the R-parity violating processes $p\bar{p}/pp\to e\mu +X$ at hadron colliders
• Discriminating between technicolor and warped extra dimensional model via pp $\to$ ZZ channel
• Revisiting the QCD corrections to the R-parity violating processes $p\bar{p}/pp\to e\mu +X$
• A reappraisal of spontaneous R-parity violation

Cited by in corpus (4)

• Minimal gauge origin of baryon triality and flavorful signatures at the LHC
• Sneutrino Identification in Lepton Pair Production at ILC with Polarized Beams
• Spin identification of heavy nonstandard bosons in dilepton and diphoton events at the LHC
• The Higgs-like boson spin from the center-edge asymmetry in the diphoton channel